Advanced Mathematics Primary 5 Geometry

ABCD is a parallelogram. ∠ABD = 65°. Find ∠DAB.

A 115°
B 65°
C 25°
D 105°
Show Worked Solution

Worked Solution

Step 1: In a parallelogram, opposite sides are parallel. So AD is parallel to BC. Step 2: The adjacent angles in a parallelogram between parallel lines add up to 180°. Step 3: ∠ABC + ∠DAB = 180°. Step 4: ∠ABC = 180° - 65° = 115°. Answer: 115°

Correct answer: 115°

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